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Methane Hydrate (MH) Petroleum and Natural gas are main energy resources. The development of new energy resources Now Future Limit of the quantity of resources Methane Hydrate (MH) Background of Research

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MH A material that Methanes molecule is surrounded in the crystallization of the caged Waters molecule forms Equilibrium conditions: Low temperature and High pressure Sediment of sea beds Eternal frozen ground area Distribution area Triangle Methanes molecule Ball Waters molecule Crystal structure of MH Background of Research

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The confirmation of existence of MH in sea area around Japan The amount of the resource : About 7.4 trillions cubic meters Equivalent to about 100 years of the amount of annual natural gas consumption in Japan(1999) Possibility of supplying energy for long term in Japan Distribution area 1. The Nankai Trough 2. Kuril Islands 3. Sea of Okhotsk 4. Tataru Trough 5. Okushiri submarine ridge 6. West Tsugaru basin Gathered MH(White ice) The gathered MH in Niigata offing

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However Background of Research MH has the possibility to become the next generation energy The influence on sea beds in the production of MH (Buckling of winze, Landslide etc.) The necessity of developing MH considering the environment problems Problem

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More stable than MH Disposal of greenhouse gases Low cost Background of Research The suggestion of developing MH with Carbon Dioxide The formation of Carbon Dioxide Hydrate (CO 2 -Hyd) Advantage Global environment problem Energy problem Solution at the same time

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Purpose of Research Evaluate the property by doing triaxial compression test on the specimen with CO 2 gas and mixture gas (emphasizing the latter one) Comparison of the strength on the simulated specimen with each of CO 2 -Hyd and MH Evaluation of utilization possibility of CO 2 Organization of Collaboration Methane Hydrate lab, National Institute of Advanced industrial Science and Technology

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Stress-Strain relation (mixture gas) The strength at the same level as N2 The influence of formation of Hydrate: small Increase of the saturation degree of Sh than that in 6 Increase of the strength 9MPa

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Future problem Applying the triaxial compression test under the conditions more close to in-situ Realization of MH development by using CO 2 Elucidation of the change of hydrate saturation degree by the influence of Nitrogen when using the mixture gas